The purpose of this study is to determine if patients implanted with a St. Jude Medical (SJM) implantable cardioverter defibrillator (ICD) will benefit by using AutoIntrinsic Conduction Search (AICS) rather than only a programmed AV/PV delay. This study will compare the two methods of programming with respect to intrinsic activity.

Patients in this arm have Autointrinsic conduction search programmed ON.

Device: Autointrinsic Conduction Search Algorithm

Autointrinsic conduction search is programmed on in those patients randomized to AICS ON.

No Intervention: AICS Off

Patients assigned to this arm do not have Autointrinsic Conduction Search programmed on.

Eligibility

Ages Eligible for Study:

18 Years and older

Genders Eligible for Study:

Both

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

Patient has been implanted with a dual chamber SJM ICD with AICS for 1 month (± 2 weeks).

At the time of enrollment, patient is paced in the right ventricle (RV) ≤25% of the time as determined by the device diagnostics.

Patient is medically stable.

Exclusion Criteria:

Patient has evidence of atrioventricular (AV) block (first, second or third degree) such that ventricular pacing would be required as part of the patient's routine management

Patient is unable to comply with the follow-up visits due to geographical, psychological, or any other reasons.

Patient is younger than 18 years of age.

Patient is pregnant.

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study.
To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00187239

ICDs
Ventricular pacing
Patient has been implanted with a dual chamber SJM ICD with AICS for 1 month (± 2 weeks).
At the time of enrollment, patient is paced in the RV ≤25% of the time as determined by the device diagnostics.
Patient is medically stable.